tolong yaa kak.....................

PQ = PR
∠QPR = 50°
∠PQR = ∠QRP = (180 - 50) / 2 = 130 / 2 = 65°

∠UQR = ∠QRU = 1/2 x 65 = 32,5°

∠QUR = 180 - ∠UQR - ∠QRU
            = 180 - 32,5 - 32,5
            = 115°

jawaban D